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[libc++] Add a release note about C++03 being frozen after LLVM 21 #95894

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6 changes: 5 additions & 1 deletion libcxx/docs/ReleaseNotes/19.rst
Original file line number Diff line number Diff line change
Expand Up @@ -155,8 +155,12 @@ LLVM 20

LLVM 21
~~~~~~~
TODO

- The status of the C++03 implementation will be frozen. This means that non-critical bug fixes will not be back-ported
to C++03, including LWG issues. C++03 is a legacy platform, where most projects are no longer actively maintained. To
reduce the amount of fixes required to keep such legacy projects compiling with up-to-date toolchains, libc++ freezes
the current status of the headers and avoids making any changes to these headers.
See https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc for more details.
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